diff options
| -rw-r--r-- | R/inverse.predict.lm.R | 3 | ||||
| -rw-r--r-- | R/lod.R | 26 | ||||
| -rw-r--r-- | inst/doc/chemCal-001.pdf | 4 | ||||
| -rw-r--r-- | inst/doc/chemCal.log | 8 | ||||
| -rw-r--r-- | inst/doc/chemCal.pdf | bin | 107518 -> 107539 bytes | |||
| -rw-r--r-- | inst/doc/chemCal.tex | 6 |
6 files changed, 26 insertions, 21 deletions
diff --git a/R/inverse.predict.lm.R b/R/inverse.predict.lm.R index b48c967..2ead9fb 100644 --- a/R/inverse.predict.lm.R +++ b/R/inverse.predict.lm.R @@ -55,11 +55,12 @@ inverse.predict.rlm <- function(object, newdata, ..., yx <- split(object$model$y,object$model$x) n <- length(yx) + df <- n - length(objects$coef) x <- as.numeric(names(yx)) ybar <- sapply(yx,mean) yhatx <- split(object$fitted.values,object$model$x) yhat <- sapply(yhatx,mean) - se <- sqrt(sum(w*(ybar - yhat)^2)/(n-2)) + se <- sqrt(sum(w*(ybar - yhat)^2)/df) if (ss == "auto") { ss <- se } else { @@ -1,23 +1,27 @@ -lod <- function(object, ..., alpha = 0.05, beta = 0.05, n = 1, w = "auto") +lod <- function(object, ..., alpha = 0.05, beta = 0.05) { UseMethod("lod") } -lod.default <- function(object, ..., alpha = 0.05, beta = 0.05, - n = 1, w = "auto") +lod.default <- function(object, ..., alpha = 0.05, beta = 0.05) { stop("lod is only implemented for univariate lm objects.") } -lod.lm <- function(object, ..., alpha = 0.05, beta = 0.05, n = 1, w = "auto") +lod.lm <- function(object, ..., alpha = 0.05, beta = 0.05) { - f <- function(x) { - y1 <- predict(object, data.frame(x = 0), interval="prediction", + y0 <- predict(object, data.frame(x = 0), interval="prediction", level = 1 - alpha) - y2 <- predict(object, data.frame(x = x), interval="prediction", - level = 1 - beta) - (y2[[1,"lwr"]] - y1[[1,"upr"]])^2 + yc <- y0[[1,"upr"]] + xc <- inverse.predict(object,yc)[["Prediction"]] + f <- function(x) + { + # Here I need the variance of y values as a function of x or + # y values + # Strangely, setting the confidence level to 0.5 does not result + # in a zero confidence or prediction interval } - tmp <- optimize(f,interval=c(0,max(object$model$x))) - return(tmp$minimum) + lod.x <- optimize(f,interval=c(0,max(object$model$x)))$minimum + lod.y <- predict(object, data.frame(x = lod.x)) + return(list(x = lod.x, y = lod.y)) } diff --git a/inst/doc/chemCal-001.pdf b/inst/doc/chemCal-001.pdf index e2992fc..8375fd5 100644 --- a/inst/doc/chemCal-001.pdf +++ b/inst/doc/chemCal-001.pdf @@ -2,8 +2,8 @@ %ρ\r 1 0 obj << -/CreationDate (D:20060512235955) -/ModDate (D:20060512235955) +/CreationDate (D:20060515234125) +/ModDate (D:20060515234125) /Title (R Graphics Output) /Producer (R 2.3.0) /Creator (R) diff --git a/inst/doc/chemCal.log b/inst/doc/chemCal.log index 110dbec..785a8cf 100644 --- a/inst/doc/chemCal.log +++ b/inst/doc/chemCal.log @@ -1,4 +1,4 @@ -This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4) (format=pdflatex 2006.4.5) 12 MAY 2006 23:59 +This is pdfeTeX, Version 3.141592-1.21a-2.2 (Web2C 7.5.4) (format=pdflatex 2006.4.8) 15 MAY 2006 23:41 entering extended mode **chemCal.tex (./chemCal.tex @@ -325,8 +325,8 @@ LaTeX Font Info: External font `cmex10' loaded for size [2 <./chemCal-001.pdf>] [3] (./chemCal.aux) ) Here is how much of TeX's memory you used: - 3764 strings out of 94499 - 51832 string characters out of 1175814 + 3764 strings out of 94500 + 51832 string characters out of 1175772 96290 words of memory out of 1000000 6863 multiletter control sequences out of 10000+50000 21774 words of font info for 52 fonts, out of 500000 for 2000 @@ -346,4 +346,4 @@ type1/bluesky/cm/cmbx12.pfb> </var/cache/fonts/pk/ljfour/jknappen/tc/tctt1000.6 xmf-tetex/fonts/type1/bluesky/cm/cmtt10.pfb></usr/share/texmf-tetex/fonts/type1 /bluesky/cm/cmr10.pfb></usr/share/texmf-tetex/fonts/type1/bluesky/cm/cmr12.pfb> </usr/share/texmf-tetex/fonts/type1/bluesky/cm/cmr17.pfb> -Output written on chemCal.pdf (3 pages, 107518 bytes). +Output written on chemCal.pdf (3 pages, 107539 bytes). diff --git a/inst/doc/chemCal.pdf b/inst/doc/chemCal.pdf Binary files differindex 8e3249b..e73cc52 100644 --- a/inst/doc/chemCal.pdf +++ b/inst/doc/chemCal.pdf diff --git a/inst/doc/chemCal.tex b/inst/doc/chemCal.tex index 4dbdce3..a9e8495 100644 --- a/inst/doc/chemCal.tex +++ b/inst/doc/chemCal.tex @@ -63,13 +63,13 @@ $Prediction [1] 5.865367 $`Standard Error` -[1] 0.892611 +[1] 0.7288138 $Confidence -[1] 2.478285 +[1] 2.023511 $`Confidence Limits` -[1] 3.387082 8.343652 +[1] 3.841856 7.888878 \end{Soutput} \end{Schunk} |